Add a pointer to the lsif-go-action repository (#53)

This is a breadcrumb to help users see the connection between the indexer and the CI configuration. We may want to consolidate some of the CI workflows in the future, but for now I wanted to ensure the reader can at least find one of them.
sourcegraph · Apr 11, 2020 · a80709a · a80709a
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 ```
 
 Use `lsif-go --help` for more information.
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+## Updating your index
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+To keep your index up-to-date, you can add a step to your CI to generate new data when your repository changes.  For example, you can use our [LSIF Go action workflow](https://github.com/sourcegraph/lsif-go-action) to generate and upload an index in GitHub Actions.